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Georges Michaud

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Professeur émérite

Faculté des arts et des sciences - Département de physique

georges.michaud@umontreal.ca

Courriels

michaudg@astro.umontreal.ca (Travail)

Travail 2 : 514 369-5261

Travail 1 : 514 343-6672

Affiliations

Areas of Expertise

  • Stellar
  • Elementary Particles
  • Atmosphere (Including Chemical Aspects)
  • Chemical Composition
  • Chemical Processes
  • Modelization and Simulation
  • Theory for calculus

We have introduced atomic diffusion into a stellar evolution code and obtain stellar models where particle transport is treated in the radiative zones. Radiative accelerations are calculated self consistently using the atomic data originally used by OPAL to obtain their opacity tables.

In Pop I stars it has been shown that an iron convection zone appears in all F, A and B stars where rotation and mass loss are negligible. By increasing the mass of the convective core, atomic diffusion modifies the morphology of the turnoff and the assumption of core overshoot in solar metallicity clusters such as M67 becomes unnecessary. We are currently investigating the role of mass loss as a competing process in particular for AmFm stars and the effect of the suggested change of solar metallicity on cluster morphology.

In Pop II stars, the evolution has been carried out successfully from the zero age main sequence to the middle of the horizontal branch. It has been shown that the assumption of core overshoot, which has always been made since suggested in 1970, is unnecessary since atomic diffusion of Carbon from the core is sufficient to insure convective neutrality at the helium burning core boundary causing a 50 % increase in the mass of the convective core. It has furthermore been shown that the overabundance of, for instance, iron by a factor of ~100 in the hot horizontal branch stars of M15 is explained by atomic diffusion driven by radiative accelerations. We are currently extending the calculations to the end of the horizontal branch and beyond and study the effect of varying the metallicity on the properties of the horizontal branch of clusters where abundance anomalies have been observed. These calculations will also be compared to observations of field sdB stars. A complete grill of models is being generated for Pop II stars and they will be used to interpret the implications of WMAP for the Li abundance, taking into account the latest developments.

Student supervision Expand all Collapse all

Étude de l'influence de la perte de masse sur l'évolution d'étoiles de plusieurs types Thèses et mémoires dirigés / 2011 - 2011
Graduate : Vick, Mathieu M.
Cycle : Doctoral
Grade : Ph. D.
Étude de l'influence de la perte de masse sur l'évolution des anomalies d'abondances dans les étoiles AmFm Thèses et mémoires dirigés / 2006 - 2006
Graduate : Vick, Mathieu
Cycle : Master's
Grade : M. Sc.
Développement d'anomalies d'abondances dans les étoiles de la branche horizontale en présence de circulation méridienne Thèses et mémoires dirigés / 2006 - 2006
Graduate : Quievy, Delphine
Cycle : Master's
Grade : M. Sc.

Research projects Expand all Collapse all

CALCUL QUEBEC Projet de recherche au Canada / 2015 - 2023

Co-researchers : Jesse Shapiro , Mohamed Hijri , Daniel Sinnett , Mark E. Samuels , Laurent J. Lewis , Normand Mousseau , Anne Bruneau , Georges Michaud , François Schiettekatte , Rémy Sauvé , Michel Côté , Pierre-Louis Bellec , Damian Labuda , Jacques Drouin , Louis Jean Dubé , Guy Dumas , Marc Parizeau , Louis Pérusse , Alain De Champlain , Daniel Reinharz , Hugo Martel , Christian Gagné , Arnaud Droit , Frédéric Maps , R Platt , Alan C Evans , W Robert J Funnell , Hong Guo , Victoria Kaspi , Sang Yong Jeon , Nikolas Provatas , Russell Davidson , Jackalyn Marie Vogel , Nicolas Moitessier , Guy Moore , Sivakumaran Nadarajah , Abdelkader Baggag , Erica Moodie , Jacek A. Majewski , Andrew Piper , Luc Mongeau , Guillaume Bourque , Stefan Sinclair , Daniel Joseph Kirshbaum , Jun Song , Brigitte Jaumard , Jean-Yves Trépanier , François Guibault , François Bertrand , Alain Rochefort , Frédéric Sirois , Éric Laurendeau , Georges Dionne , Wagdi Habashi , G. Peslherbe , Thomas Fevens , Marius Paraschivoiu , Ali Dolatabadi , André Dieter Bandrauk , André-Marie Tremblay , Pierre Proulx , Noureddine Atalla , David Sénéchal , Armand Soldera , Kalifa Goïta , Alexandre Blais , Claude Legault , Stéphane Moreau , Hugo Larochelle , Pierre-Étienne Jacques , Gabriel Crainic , René Laprise , Pierre Gauthier , Laxmi Sushama , Simon Guillotte , Adam Skorek , Patrizio Antici , Dany Dumont , François Vidal , Jannette Frandsen , Lorne Archie Nelson , Martin Aube , Leandro Coelho , Marie-Jean Meurs
Funding sources: FRQNT/Fonds de recherche du Québec - Nature et technologies (FQRNT)
Grant programs: PVXXXXXX-(RS) Programme de regroupements stratégiques

Centre de recherche en astrophysique du Québec (CRAQ) Projet de recherche au Canada / 2016 - 2018

Lead researcher : Pierre Bergeron
Co-researchers : Pierre Bastien , Gilles Fontaine , René Doyon , Anthony F. J. Moffat , Nicole St-Louis , Paul Charbonneau , Julie Hlavacek-Larrondo , Georges Michaud , Patrick Dufour , David Lafrenière , Daniel Nadeau , Laurent Drissen , Gilles Joncas , Serge Pineault , Carmelle Robert , Hugo Martel , Simon Thibault , David Scott Hanna , Kenneth J Ragan , Victoria Kaspi , Andrew Cumming , Robert Rutledge , Gilbert Holder , Matthew Dobbs , tracy Webb , Lorne Archie Nelson
Funding sources: FRQNT/Fonds de recherche du Québec - Nature et technologies (FQRNT)
Grant programs: PVXXXXXX-(RS) Programme de regroupements stratégiques

CENTRE DE RECHERCHE EN ASTROPHYSIQUE DU QUEBEC Projet de recherche au Canada / 2008 - 2017

Lead researcher : Pierre Bergeron
Co-researchers : Pierre Bastien , Gilles Fontaine , René Doyon , René Racine , Serge Demers , Anthony F. J. Moffat , Robert Lamontagne , Nicole St-Louis , Claude Carignan , Paul Charbonneau , François Wesemael Succ. , Alain Vincent , Georges Michaud , Patrick Dufour , David Lafrenière , Jacques Richer , Daniel Nadeau , Ermanno F. Borra , Laurent Drissen , Gilles Joncas , Serge Pineault , Carmelle Robert , Hugo Martel , David Scott Hanna , Kenneth J Ragan , Victoria Kaspi , Andrew Cumming , Robert Rutledge , Gilbert Holder , Michel M. Bourqui , Matthew Dobbs , tracy Webb , Ludvik Martinu , Martin Riopel , Sébastien Blais-Ouellette , Jean Dupuis , Frederic Grandmont , Simon Thibault , Sylvie Florence Beaulieu , Lorne Archie Nelson , Martin Aube
Funding sources: FRQNT/Fonds de recherche du Québec - Nature et technologies (FQRNT)
Grant programs: PVXXXXXX-(RS) Programme de regroupements stratégiques

EVOLUTION STELLAIRE ET PROCESSUS HYDRODYNAMIQUES DE TRANSPORT Projet de recherche au Canada / 1994 - 2017

Lead researcher : Georges Michaud
Funding sources: CRSNG/Conseil de recherches en sciences naturelles et génie du Canada (CRSNG)
Grant programs: PVX20965-(RGP) Programme de subvention à la découverte individuelle ou de groupe

ÉVOLUTION STELLAIRE ET PROCESSUS HYDRODYNAMIQUES DE TRANSPORT Projet de recherche au Canada / 2011 - 2015

Lead researcher : Georges Michaud

Recognition and Awards

  • Prix Marcel-Vincent, Association francophone pour le savoir (Acfas), 1979.
  • Bourse Killam, Conseil des arts du Canada, 1987.
  • Société royale du Canada : Les Académies des arts, des lettres et des sciences du Canada, Société royale du Canada, 1992.

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